Nitrogen use efficiency during fertilization based on N sensors. The use of nitrogen (N) sensors for fertilization has many advantages over conventional fertilization. Nitrogen sensors allow to accurately determine the nitrogen demand of plants in real time. With nitrogen sensors, wheat yield can increase from 3% to 6%, and fertilizer costs can decrease from 2% to 13%. Nitrogen sensors help optimize resource utilization, allowing farmers to make data-driven decisions. In the Nutricheck project at the K?dainiai Farmers Nutrition Club, when evaluating nitrogen fertilization in winter wheat, fertilization with an N sensor (in interaction with other precision technologies used on the farm) allowed for more efficient use of nitrogen in winter wheat, compared to N fertilization according to the recommended rates for the planned yield. When adjusting N fertilization with an N sensor, a total of 155 kg/ha N was applied to winter wheat, plants accumulated 275 kg/ha of nitrogen, and the resulting wheat yield was 8.8 t/ha. On the farm where winter wheat was fertilized according to the recommended N rates for the planned yield, 215 kg/ha N was applied, plants accumulated 233 kg/ha N. The resulting yield was 7.1 t/ha. Nitrogen use efficiency in winter wheat using an N sensor was 110 EUR/ha, compared to N fertilization according to the recommended N rates.